raspberrypi.conf: add IMAGE_BOOT_FILES
raspberrypi.conf: add IMAGE_BOOT_FILES

Add IMAGE_BOOT_FILES that defines a list of files to be placed in boot
partition. The variable is effectivey used with wic when building a SD
card image.

Change-Id: Ie7b2ea032349bf33ce7a9afc70e2fb4806ff9a04
Signed-off-by: Maciej Borzecki <f609d9f713abcd5f8f0e51f08dc151638a7681e7@open-rnd.pl>
Signed-off-by: Maciek Borzecki <1558056f63c11e0ac61f70a6066c1af22512ca0b@gmail.com>
Acked-by: Andrei Gherzan <8dc7c09356db0b1762fb140617d7375c0a5a4131@gherzan.ro>

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